Does the emission of pre-seminal fluid (madhy) or vaginal discharge after the menstrual period indicate purity (tahara)?

A woman recognizes ritual purity (tuhr) by one of two signs: dryness (al-jufuf), which means inserting a cotton swab and it comes out clean, with no trace of blood, yellowish discharge, or brownish discharge on it; or the white discharge (al-qassah al-bayda'). The presence of normal moisture or seeing pre-ejaculate (madhy) does not negate purity if one of these two signs is confirmed. In such a case, one must perform istinja (definition)' from the madhy and purify whatever parts of the body or clothes it touched.